Pipe elbow specifications should match the direction change, pressure rating, material, wall thickness and pipeline standard. Elbows are used when the pipe route needs a 45 degree, 90 degree or 180 degree change while maintaining flow and mechanical strength.
45 degree pipe elbows
45 degree pipe elbows provide a moderate direction change and are often used when a smoother routing adjustment is needed.
90 degree pipe elbows
90 degree pipe elbows are the most common choice for right-angle changes in industrial piping layouts. Buyers should confirm long radius or short radius requirements.
180 degree pipe elbows
180 degree pipe elbows are used for return bends and special piping loops where the flow direction needs to reverse.
What to specify
Important details include nominal pipe size, schedule or wall thickness, radius, material grade, standard, end preparation, surface treatment and quantity. The main pipe elbows page gives an overview of the category.
Related fittings
Elbows are often purchased together with flanges, pipe tees and reducers. For a quotation, contact PipingFitting.com.
Further Reading
You may also find these guides helpful:
Wall Thickness & Schedule Selection
Elbow walls follow the pipe schedule: SCH10 for utility and jacketed service, SCH40/STD as the process default, SCH80/XS where pressure or corrosion allowance demands, SCH160/XXS for severe service. Because B16.9 center-to-end dimensions are identical across schedules, an SCH80 elbow drops into the same space as SCH40 – only the wall and weight change. See the full pipe schedule chart.
Material Grades Explained
A234 WPB – the standard carbon steel elbow grade for water, oil, steam and air to about 425°C. A420 WPL6 – low-temperature carbon steel for service to -46°C. A403 WP304/304L – general stainless; WP316/316L adds molybdenum for chloride resistance. Alloy WP11 (1.25Cr-0.5Mo) and WP22 (2.25Cr-1Mo) serve high-temperature steam above 500°C. Match the fitting grade to the pipe grade – weldability and strength must agree.
Marking & Traceability
Every B16.9 elbow ships marked with: manufacturer, size, schedule, material grade and heat number – e.g. “PF 4″ SCH80 A234 WPB HT-20260812”. The heat number links the piece to its mill certificate, so site inspectors can verify chemistry and mechanicals. OEM marking with your logo is available on request.
FAQs
What does WPB mean? Weldable Pipe, grade B – the A234 specification’s standard carbon steel grade with 70 ksi minimum tensile.
Can I get elbows with bevel ends for thin-wall pipe? Yes – bevel angle and lands are machined per schedule; SCH5S/10S stainless gets a special thin-wall bevel. State the schedule when ordering.